Well that’s the thing, it wouldn’t be possible so the entire idea of “let us sane people come” is flawed from the start unless they truly believe that there should be a purity test and that they would pass it. Anyone who genuinely thinks that way should be immediately disqualified from immigrating based on their own idea of an ideological test.

“I’m different though and there should be actual, real laws to permit to do particular things!” is not the position of someone who considers their community at large to any particularly special degree. And to be clear I’m all for banning hate speech and stuff because that’s a specific banned behaviour and not a specific allowed behaviour, and we have evidence to show that it can be as harmful as any physically violent attack.